It sounds like a difficult schedule. Your DC will be about a year old? That should help a bit. I went back to work when my DD was a year old and she adjusted fine- it helped a lot that she was eating solids and comfortable with DH and with my parents.
It sounds like your schedule is pretty intense, though, with long work hours and being gone overnight when you are on call. I don't have any experience with that particular set of challenges. What I would say is to start talking about it now. Even an infant can benefit from that. Also, if it isn't already the case, make sure dad and any other caregivers are building a good relationship. It's not as hard for mom to be gone when there are other trusted people in DC's life who know some of the ins and outs of caring for the child. 4 hrs by himself is a good start, but make sure that dad is doing lots of caring for DC even when you are there.
It sounds like your schedule is pretty intense, though, with long work hours and being gone overnight when you are on call. I don't have any experience with that particular set of challenges. What I would say is to start talking about it now. Even an infant can benefit from that. Also, if it isn't already the case, make sure dad and any other caregivers are building a good relationship. It's not as hard for mom to be gone when there are other trusted people in DC's life who know some of the ins and outs of caring for the child. 4 hrs by himself is a good start, but make sure that dad is doing lots of caring for DC even when you are there.